Dust-collecting eraser.



U. MOOLINTOGK 6L L. MoTURNAN.

DUST GOLLEGTING BRASBR.

APPLICATION FILED FBB.4,1913.

Patented Apr. 7, 1914.

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COLUMBIA PLANOGRAPH co. WASHINGTON. D. C.

CHARLES IVICCLINTOCK AND LEA MCTURNAN, OF ELWOOD, INDIANA.

DUST-COLLECTING ERLASER."

Specification of Letters Patent.

Patented Apr. 7, 19t/t.

Application lecl February 4, 1913. Serial No. 746,209.

To all to/wm t may concern Be it known that we, CHARLES MGCLIN- 'roon and LEA MCTURNAN, citizens of the United States, residing at Elwood, in the county of Madison and State of Indiana, have invented certain new and useful lmprovements in Dust-Collecting Erasers, of which the following is a specification.

This invention relates to an improved dust collecting eraser, and has particularly in view a novel construction of back member.

In various uses of blackboard erasers, particularly in school rooms, annoyance 1s often caused by the common wooden back eraser being frequently knocked from the chalk ledge onto the floor, thereby making an objectionable noise, also the cost of wood for the purpose of making eraser backs is of importance from the manufacturing standpoint.

Therefore, the object of the present invention is to construct an inexpensive, light, and very strong article that is especially adapted for use as a back for blackboard erasers. The material employed for the production thereof is preferably corrugated straw board or equivalent material assembled and secured together in a novel manner to secure maximum strength and lightness as well as to provide a chambered back for the collection and retention of chalk dust.

With the above and other objects in view, which will more readily appear as the description of the invention proceeds, the same consists in the novel construction, combina` tion, and arrangement of parts hereinafter more fully described, illustrated, claimed.

The essential features of this invention are necessarily susceptible of a wide range of structural modilication, without departing from the spirit or sacrificing any of the advantages thereof within the scope of the appended claims. However, a preferred and practical embodiment 1s shown 1n the accompanying drawings, in which- Figure l is a perspective view of an eraser, portions of which are broken away to show the present invention. Fig. 2 is a transverse sectional view of the structure shown in Fig. l. Fig. 3 is an enlarged detail perspective view of one of the body forming units.

Similar reference characters designate and corresponding parts in the several figures of the drawings.

Referring specifically to the details of construction embodied in the present inven tion, and shown in the several figures of the accompanying drawings, the reference character l designates the dust collecting eraser back in its entirety, which is composed of a plurality of back forming units 2 arranged parallel and side by side, which are made of card board, straw board, or equivalent paper product.

The arrangement of the back forming units 2 above described, produces a body that is able to withstand flexing stresses of considerable degree without bending. Each of the said units 2 forming the body l, is coinposed of the side walls 3 which have secured therebetween the corrugated connecting wall d which is of preferably the same material as the outside walls, and extends throughout the length of the chamber formed there by. ln addition to connecting the side walls 3, the corrugated wall 4 spaces the former apart and forms a multiplicity of dust col lecting spaces or pockets 5 in the unit, thus rendering the same unusually light. However, the strength of each individual body unit is greatly increased and made more effectiveby the method employed in arranging the same to form the back member l. This method consists in placing a plurality of units 2 parallel and side by side in closely abutting relation after having a coating of cement placed on the outside of the walls 3. l/Vhen these units become thus secured together, they form a honey-comb structure which has a stiff body and which is rather inflexible in all directions. The main body l is further strengthened and reinforced by the base member 6 whichis cemented to one of the honey-comb sides of the body l. The construction of the said base-member 6 is smilar to that of the units 2, the same having top and bottom paper sheets 7 and 8 respectively, which are connected and spaced apart by the corrugated sheet 9. The said sheets 7 and 8 of the base member 6 are co-eXtensive with the entire width and length of the back member l, and the side edges thereof project slightly beyond the outer wall 3 of each of the end-back-forming units 2 and thereby form linger gripping ledges 10 which facilitate the manipulation of the complete eraser when in use.

Aside from producing an article that is particularly light and durable for use in an eraser back, this invention also provides for cushioning the shock and noise incident to an eraser back striking the floor when the same is knocked from the chalk ledge or dropped. This feature is provided for by cementing a cushion of felt 11 or equivalent material entirely over the base member 6 so that it also covers the corner edges and ends of the chambered back member 1. However, before the felt has been cemented in place, there is placed between it and the base member G the side strips 12 which may be either of paper or of cloth and which have the flaps 13 that are adapted to be pasted upwardly over the exposed raw side edges of the member 6 and the outer walls 3 'of the end back-forming units 2, thus completely concealing the interior construction of the body. To complete the eraser, the remaining uncovered honey-combed side of the body opposite the side closed by the backing 6 is covered by the perforated eraser pad 14 which is made of felt or similar material. rlhe perforations 15 in the pad 14 are in communication with the pockets 5 formed in the body units 2 and carry chalk dust accumulated by the pad back into the pockets, where the same is held until it is beaten or shaken out.

We claim:

1. A dust collecting eraser comprising a chambered back consisting of a plurality of paper units including corrugated strips disposed on edge to provide a multiplicity units each 'comprising side walls spaced 1 apart by a corrugated connecting wall, and having the meeting side walls of adjoining units cemented together, a base member also comprising sheets spaced apart by a corrugated connecting sheet cemented to one honeycombed face of the back member, side strips `having flaps adapted to cover the eX- Y posed side edges of the base and back memv ber, a cushion strip for covering theends and back of the body member, and an eraser pad secured to the remaining chambered face of the back member.

In testimony whereof we hereuntoV ai'lix our signatures in the presence of two witnesses; A A

CHARLES MGCLINTOGK. LEA MCTURNAN. Y

Vitnesses Y ELI l). MYERS,

VEDITH l?. MYERS.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, I). C. 

